I have a model class:
public class something
{
public int id { get; set; }
public string name { get; set; }
public string desc { get; set; }
}
And this is my ContextModelSnapshot:
partial class ContextModelSnapshot : ModelSnapshot
{
protected override void BuildModel(ModelBuilder modelBuilder)
{
modelBuilder.Entity("My.Data.Models.Something", b =>
{
b.Property<int>("id")
.HasColumnType("int");
b.Property<string>("name")
.HasColumnType("nvarchar(max)");
b.Property<string>("desc")
.HasColumnType("nvarchar(max)");
b.Property<int>("id1")
.HasColumnType("int");
b.ToTable("something", t => t.ExcludeFromMigrations());
});
Note: from the ContextModelSnapshot.cs there is an extra property called id1, this is NOT in my model and it is causing errors when I attempt to use my model. I would like to get rid of this, but I do not know how.
Related
I am new to EF Core and am trying to use TPH Inheritance with Entity Framework Core
I have the following classes defined
public class WorkItem {
public Guid Id { get; set; }
public string WorkItemType { get; set; }
public string Description { get; set; }
}
public class Job : WorkItem {
public string BillingNotes { get; set; }
}
In my context, I have
public class JobContextNew : DbContext {
public virtual DbSet<WorkItem> WorkItem { get; set; }
public virtual DbSet<Job> Job { get; set; }
public JobContextNew(DbContextOptions<JobContextNew> options) : base(options) { }
protected override void OnModelCreating(ModelBuilder modelBuilder) {
modelBuilder.Entity<WorkItem>(entity => entity.Property(e => e.Id).ValueGeneratedNever());
modelBuilder.Entity<WorkItem>()
.HasDiscriminator(workitem => workitem.WorkItemType)
.HasValue<Job>(nameof(Job));
}
}
If I omit the field in Job, it will pull the data just fine but when I add the BillngNotes back in I get the following error: Invalid column name 'BillingNotes
Can anyone tell me what I might be doing wrong?
I am relatively new to the Code First approach to Entity Framework. I have used the Database First approach for a while now, but the Code First seems to be a better fit for the application I am currently developing. I am working with an existing MS SQL database, and I am not allowed to make any changes whatsoever to the database. The reason why I am using Code First is because the Fluent API allows me to dynamically assign a table name to a class.
That said, I have a predicament where I need to assign a relationship between 2 tables. One table, ArCodes, has a composite key made up of the CodeType and the Code (both are strings). The CodeType column determins the type of code and the Code column is the identifier unique to the code type.
public class ArCode {
[Column("cod_typ", Order = 0), Key]
public string CodeType { get; set; }
[Column("ar_cod", Order = 1), Key]
public string Code { get; set; }
[Column("desc")]
public string Description { get; set; }
}
The other table, Invoices, needs to have a relationship to the ArCodes table for both a "ship via" code and a "terms" code.
public class Invoice {
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
[Column("shp_via_cod")]
public string ShipViaCode { get; set; }
public ArCode ShipVia { get; set; }
[Column("terms_cod")]
public string TermsCode { get; set; }
public ArCode Terms { get; set; }
}
I would like to setup the relationship for both the "ShipVia" property and the "Terms" property. However, I am not sure how to do so in regards to the CodeType portion of the composite key. For "ship via" codes the Code Type should be "S", and code "terms" codes, the code type should be "T".
I have tried the following in by DB Context, but it did not work:
protected override void OnModelCreating(DbModelBuilder modelBuilder) {
// setup the table names
modelBuilder.Entity<ArCode>().ToTable("ARCODS" + CompanyCode);
modelBuilder.Entity<Invoice>().ToTable("IHSHDR" + CompanyCode);
//
// setup the relationships
//
// 1 Invoice <--> 0-1 Ship Via AR Codes
modelBuilder.Entity<Invoice>()
.HasOptional(invoice => invoice.ShipVia)
.WithMany()
.HasForeignKey(invoice => new { TheType = "S", invoice.ShipViaCode })
;
base.OnModelCreating(modelBuilder);
}
Any help would be appreciated.
Update #1
Ok, I reduced my code to its simplest form, and I followed the solution as provided by #GertArnold.
public abstract class ArCode {
[Column("cod_typ")]
public string CodeType { get; set; }
[Column("ar_cod")]
public string Code { get; set; }
[Column("terms_desc")]
public string TermsDescription { get; set; }
[Column("terms_typ")]
public string TermsType { get; set; }
[Column("shp_via_desc")]
public string ShipViaDescription { get; set; }
[Column("tax_desc")]
public string TaxDescription { get; set; }
}
public class TermsCode : ArCode { }
public class ShipViaCode : ArCode { }
public class Invoice {
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
[Column("hdr_invc_dat")]
public DateTime InvoiceDate { get; set; }
[Column("shp_via_cod")]
public string ShipViaCode { get; set; }
public ShipViaCode ShipVia { get; set; }
[Column("terms_cod")]
public string TermsCode { get; set; }
public TermsCode Terms { get; set; }
public Invoice() {
}
}
public class PbsContext : DbContext {
public DbSet<Invoice> Invoices { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder) {
modelBuilder.Entity<Invoice>().ToTable("IHSHDR");
modelBuilder.Entity<ArCode>().HasKey(r => r.Code).ToTable("ARCODS");
modelBuilder.Entity<TermsCode>().Map(m => m.Requires("CodeType")
.HasValue("T").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
modelBuilder.Entity<ShipViaCode>().Map(m => m.Requires("CodeType")
.HasValue("S").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
base.OnModelCreating(modelBuilder);
}
public PbsContext()
: base("name=PbsDatabase") {
}
}
However, the following code returns an error:
PbsContext context = new PbsContext();
var invoice = context.Invoices.OrderByDescending(r => r.InvoiceDate).FirstOrDefault();
error 3032: Problem in mapping fragments starting at line 28:Condition member 'ArCode.cod_typ' with a condition other than 'IsNull=False' is mapped. Either remove the condition on ArCode.cod_typ or remove it from the mapping.
If I remove the "CodeType" column from the ArCode class and change all "CodeType" references to the database column name of "cod_typ" within the OnModelCreating event, then the statement above executes without error. However, invoice.ShipVia and invoice.Terms will both be null event though there is a matching record in the database.
Update #2
public abstract class ArCode {
[Column("ar_cod")]
public string Code { get; set; }
[Column("terms_desc")]
public string TermsDescription { get; set; }
[Column("terms_typ")]
public string TermsType { get; set; }
[Column("shp_via_desc")]
public string ShipViaDescription { get; set; }
[Column("tax_desc")]
public string TaxDescription { get; set; }
}
public class TermsCode : ArCode { }
public class ShipViaCode : ArCode { }
public class Invoice {
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
[Column("hdr_invc_dat")]
public DateTime InvoiceDate { get; set; }
[Column("shp_via_cod")]
public ShipViaCode ShipVia { get; set; }
[Column("terms_cod")]
public TermsCode Terms { get; set; }
public Invoice() {
}
}
public class PbsContext : DbContext {
public DbSet<Invoice> Invoices { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder) {
modelBuilder.Entity<Invoice>().ToTable("IHSHDR");
modelBuilder.Entity<ArCode>().HasKey(r => r.Code).ToTable("ARCODS");
modelBuilder.Entity<TermsCode>().Map(m => m.Requires("CodeType")
.HasValue("T").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
modelBuilder.Entity<ShipViaCode>().Map(m => m.Requires("CodeType")
.HasValue("S").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
base.OnModelCreating(modelBuilder);
}
public PbsContext()
: base("name=PbsDatabase") {
}
}
Now, the following code returns an error:
PbsContext context = new PbsContext();
var invoice = context.Invoices.OrderByDescending(r => r.InvoiceDate).FirstOrDefault();
EntityCommandExecutionException - Invalid column name 'ShipVia_Code'. Invalid column name 'Terms_Code'.
What you want is impossible for EF. ArCode has a composite key, so any association to it will have to use two Properties. That means that in Invoice you'd need four properties (two pairs) to refer to the two ArCode objects. But two of these properties (those for CodeType) are not backed up by columns in the database, so EF can not map them.
But... there is a way that may help you out. You could create two derived classes from ArCode and let Invoice refer to those by single-property associations. But then you have to divert from the model as such and fool EF a bit by defining a single key:
public abstract class ArCode { ... } // abstract!
public class TermsCode : ArCode { }
public class ShipViaCode : ArCode { }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Invoice>().ToTable("IHSHDR");
modelBuilder.Entity<Invoice>().HasOptional(i => i.Terms).WithOptionalDependent().Map(m => m.MapKey("terms_cod"));
modelBuilder.Entity<Invoice>().HasOptional(i => i.ShipVia).WithOptionalDependent().Map(m => m.MapKey("shp_via_cod"));
modelBuilder.Entity<ArCode>().HasKey(a => a.Code).ToTable("ARCODS");
modelBuilder.Entity<TermsCode>().Map(m => m.Requires("CodeType")
.HasValue("T").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
modelBuilder.Entity<ShipViaCode>().Map(m => m.Requires("CodeType")
.HasValue("S").HasColumnType("varchar").HasMaxLength(1).IsRequired())
.ToTable("ARCODS");
base.OnModelCreating(modelBuilder);
}
public class Invoice
{
[Column("pi_hist_hdr_invc_no"), Key]
public int InvoiceNumber { get; set; }
public ShipViaCode ShipVia { get; set; }
public TermsCode Terms { get; set; }
}
This may work for you if you don't have to insert ARCODS records through EF. It won't allow you to insert records with identical Codes, although the database would allow it. But I expect the content of ARCODS to be pretty stable and maybe it is enough to fill it with a script.
Here a simple model:
public class Product1
{
public int Id { get; set; }
public double Price { get; set; }
public int CurrencyID { get; set; }
public Currency Currency { get; set; }
}
public class Product2
{
public int Id { get; set; }
public double Price { get; set; }
public int CurrencyID { get; set; }
public Currency Currency { get; set; }
}
public class Currency
{
public int Id { get; set; }
public string Name { get; set; }
public string ISO4217 { get; set; }
public string Symbol { get; set; }
}
As you can see, Currency is just a list that will be used by two different entities, but If I try to run this, it gives me an error saying that this is not valid as could lead to multiple cascade paths.
Now I'm trying to figure how to model this on OnModelCreating
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Product1>().HasRequired(p => p.Currency).WithMany().WillCascadeOnDelete(false);
modelBuilder.Entity<Product2>().HasRequired(p => p.Currency).WithMany().WillCascadeOnDelete(false);
}
But for some reason, although the product is correctly created, whenever I try to load it, Currency comes null.
What am I doing something wrong in this modelling?
Thanks!
I figured it out and I will explain here for future reference: After better looking the base created, I realized that it was creating a FK for the wrong field: P1:ID -> Currency:ID, when the correct should be P1:CurrencyID -> Currency:ID
So I found a way to force the correct FK:
modelBuilder.Entity<Product1>().HasRequired(p => p.Currency).WithMany().HasForeignKey(p => p.CurrencyId);
And that's all!
Map you classes like this:
public class Product1Mapping : EntityTypeConfiguration<Product1>
{
public Product1Mapping ()
{
ToTable("Product1");
HasKey(p => p.Id);
HasRequired(p => p.Tag).WithMany().HasForeignKey(t => t.CurrencyID);
}
}
public class Product2Mapping : EntityTypeConfiguration<Product2>
{
public Product2Mapping ()
{
ToTable("Product2");
HasKey(p => p.Id);
HasRequired(p => p.Tag).WithMany().HasForeignKey(t => t.CurrencyID);
//other properties
}
}
and change you OnModelCreating creating method like this:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Configurations.Add(new AccountMapping());
// Add other mapping classes
}
public DbSet<Product1> Product1{ get; set; }
public DbSet<Product2> Product2{ get; set; }
see these links for more information:
http://msdn.microsoft.com/en-us/data/jj591617.aspx
http://entityframework.codeplex.com/workitem/1049
I successfully mapped my complex type like this:
modelBuilder
.ComplexType<Name>()
.Property(name => name.First)
.HasColumnName("firstNameColumn");
modelBuilder
.ComplexType<Name>()
.Property(name => name.Last)
.HasColumnName("lastNameColumn");
So far so good. But notice that we do not specify any entity type. What if we want to map the same complext type also for a table with columns "firstN" and "lastN"? I tried EntityTypeConfiguration<> but you are not allowed to specify complex types there. Finally it looks like that complexTypes are defined globally.
You can also customize the complex type columns names at the entity level, like the following:
public class User
{
public int UserId { get; set; }
public Name NameInfo { get; set; }
}
public class Customer
{
public int CustomerId { get; set; }
public Name NameInfo { get; set; }
}
[ComplexType]
public class Name
{
public string First { get; set; }
public string Last { get; set; }
}
public class Context : DbContext
{
public DbSet<User> Users { get; set; }
public DbSet<Customer> Customers { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.ComplexType<Name>()
.Property(name => name.First)
.HasColumnName("firstNameColumn");
modelBuilder.ComplexType<Name>()
.Property(name => name.Last)
.HasColumnName("lastNameColumn");
// Here is how can customize the column names at the entity level:
modelBuilder.Entity<Customer>().Property(u => u.NameInfo.First)
.HasColumnName("firstN");
modelBuilder.Entity<Customer>().Property(u => u.NameInfo.Last)
.HasColumnName("lastN");
}
}
And the resultant schema will be:
Here you can find another example.
I'm creating a POCO model to use with entity framework code first CTP5. I'm using the decoration to make a property map to a PK column. But how can I define a PK on more then one column, and specifically, how can I control order of the columns in the index? Is it a result of the order of properties in the class?
Thanks!
NOTE:
As of 2019 this answer became non-valid for later EntityFramework versions.
You can specify the column order in the attributes, for instance:
public class MyEntity
{
[Key, Column(Order=0)]
public int MyFirstKeyProperty { get; set; }
[Key, Column(Order=1)]
public int MySecondKeyProperty { get; set; }
[Key, Column(Order=2)]
public string MyThirdKeyProperty { get; set; }
// other properties
}
If you are using the Find method of a DbSet you must take this order for the key parameters into account.
To complete the correct answer submitted by Slauma, you can use the HasKey method to specify an order for composite primary keys as well:
public class User
{
public int UserId { get; set; }
public string Username { get; set; }
}
public class Ctp5Context : DbContext
{
public DbSet<User> Users { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<User>().HasKey(u => new
{
u.UserId,
u.Username
});
}
}
If, like me, you prefer to use a configuration file you can do that in this way (based on Manavi's example):
public class User
{
public int UserId { get; set; }
public string Username { get; set; }
}
public class UserConfiguration : EntityTypeConfiguration<User>
{
public UserConfiguration()
{
ToTable("Users");
HasKey(x => new {x.UserId, x.Username});
}
}
Obviously you have to add the configuration file to your context:
public class Ctp5Context : DbContext
{
public DbSet<User> Users { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new UserConfiguration());
}
}
Use as a anonymous object:
modelBuilder.Entity<UserExamAttemptQuestion>().ToTable("Users").HasKey(o => new { o.UserId, o.Username });